How to duplicate ies light
I believe you are mistaking "lamp rig 10" for the actual light itself. This is only a mesh made of edges that acts as a parent to the light, making it easier to select. When you are duplicated the lamp, you only selected the lamp mesh and the lamp rig but not the actual light itself. Try going into wireframe mode and box-select (b) the lamp, which will include the actual light. Duplicating this should not have any problems.